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N0. 62|,979. Patented Mar. 28, I899. W. H. A. SIEVERTS.

APPARATUS FOR FORMING INCANDESCENCE MANTLES FUR GAS LIGHTS.

(Application filed Dec. 2, 1898.)

(No Model.)

wunms PETERs cc, PHOTO-LITHQ, WASWNGTON. n. cy

UNITED STATES PATENT OFFICE.

\VILHELM I-IEINR. AUG. SIEVERTS, O13 HAMBURG-UHLENHORST, GERMANY.

APPARATUS FOR FORMING INCANDESCENCE MANTLES FOR GAS-LIGHTS.

srnorrrcn'rron forming part of Letters Patent No. 621,979, dated March28, 1899.

Application filed December 2, 1898. Serial No- 698,101. (No model.)

To all whom it may concern:

Be it known that I, WILHELM HEINRICH AUGUST Srnvnnrs, teacher, ofHamburg-Unlenhorst, Germany, have invented certain new and usefulImprovements in Apparatus for Forming Incandescent Mantles forIncandescence Gas-Lights; and I do hereby declare that the following isa full, clear, and exact description of the invention.

This invention relates to an apparatus for forming incandescent bodies.

The object of this apparatus is in the first place to form a firm andfoldless shield or ring at the apex of the incandescent body. Theshaping of the incandescent body is ef: fected by suspending the samedirectly after its having been reduced to ashes from the top of theburner by subsequently placing the burner, together with theincandescent body, upon a disk adapted to rotate around a Bunsen burner,by then igniting the gas traversing the Bunsen burner, andbyfinallyexposing the burning and rotating incandescent body to theaction of a suitable jet or blastfurnace passing in inward direction.WVhile the burner, with the incandescent body, is rotating around theBunsen burner, illuminating-gas is introduced into the said burner at alow pressure. If then the jet or blast flame is caused to-act upon theapex in an inward direction, the apex is brought into the form of asolid shield or'ring, which prevents the body from yielding as to form apoint and so that the folds produced by the contraction of any asbestosthread will disappear. The same method may be utilized in order to causethe lower part of each incandescent mantle to closely join the head ofthe appertaining burner. Owing to the inwardly-directed andinwardly-acting jet-flame passing against the lower part of theincandescent mantle the latter is intimately applied in an inwarddirection against the burner-head and becomes softened, so that whileexactly following the outlines of the burner-head it receivescorresponding folds.

The apparatus for carrying out the methods is .illustrated in theaccompanying drawing. The same consists of a Bunsen burner a, which issurrounded by a socket d, carrying the disk I), and having its bottomend constructed in the form of a rope pulley or disk 6. The bearing forthis rope pulley or disk 0 is formed, on the. one hand, bya frame e,fixed below the table-top f, and, on the other hand, by a plate 6,located upon the said frame. The Bunsen burner is provided with externalscrew-threads upon its lower end, these screw-threads serving, to securethe burner in the frame a. This burner communicates with a gas-feed pipeg. The burner h, to which the incandescent body h is to be applied, isdrawn over the Bunsen burner a, so that the burner stands upon the disk12 and rotates therewith as soon as the rope pulley c is set in motion.Instead of this rotation being produced by the rope pulley it may alsobe obtained by means of toothed wheel-gearings. The shaping of theincandescent body is efiected during the rotation of the burningincandescent body around its Bunsen burner under the action of aninwardly-directed jet or blast flame.

Having now described and ascertained my WILllELlll IIEINR. AUG.SIEVER'IS.

WVitnesses:

EVERARD OsERLAUER, AMANDUS Homes.

